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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9a194af187c15103889178b5caee3b4c52aa5056323609505d7b60e95adb031' 
  AND token = 'v1eLyn35kCCGL3/py0jXe+oB2Luxbrn6fgw9E5jYFK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}